/* ============================================================
   style.css — Data Scientist Portfolio
   Aesthetic: Editorial monospace — dark, precise, data-driven
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:ital,wght@0,300;0,400;0,500;0,600;1,300&family=IBM+Plex+Sans:wght@300;400;500&display=swap');

/* ─── Design Tokens ──────────────────────────────────────────── */
:root {
  --bg:          #0d0f0f;
  --bg-card:     #131616;
  --bg-card-hover: #181c1c;
  --border:      #1f2626;
  --border-bright: #2e3838;
  --accent:      #00e5c0;      /* teal-green */
  --accent-dim:  #00a88a;
  --text-primary: #e8efed;
  --text-secondary: #8fa89f;
  --text-muted:  #4d6460;
  --font-mono:   'IBM Plex Mono', monospace;
  --font-sans:   'IBM Plex Sans', sans-serif;
  --radius:      4px;
  --transition:  180ms ease;
  --max-w:       1100px;
  --gutter:      clamp(1.25rem, 5vw, 3rem);
}

/* ─── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: var(--accent); text-decoration: none; transition: opacity var(--transition); }
a:hover { opacity: 0.75; }
button { cursor: pointer; font: inherit; }
img { display: block; max-width: 100%; }

/* ─── Shared layout ──────────────────────────────────────────── */
.site-header,
.about,
.projects-section,
.contact,
.site-footer {
  padding-left: var(--gutter);
  padding-right: var(--gutter);
  max-width: calc(var(--max-w) + var(--gutter) * 2);
  margin-left: auto;
  margin-right: auto;
  width: 100%;
}

/* ─── Header ─────────────────────────────────────────────────── */
.site-header {
  padding-top: clamp(2.5rem, 8vw, 5rem);
  padding-bottom: 0;
}

.header-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  color: var(--text-muted);
  padding-bottom: 1.5rem;
}

.header-grid {
  display: grid;
  grid-template-columns: 1fr 2fr 3fr;
  gap: 2rem;
  align-items: start;
}

.header-grid .header-label {
  grid-column: 1 / -1;
  padding-bottom: 0;
  margin-bottom: -1rem;
}

.header-name h1 {
  font-family: var(--font-mono);
  font-size: clamp(2.5rem, 7vw, 5.5rem);
  font-weight: 600;
  line-height: 0.95;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.header-meta {
  padding-top: 0.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.tagline {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-transform: uppercase;
}

.subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  font-style: italic;
  font-family: var(--font-mono);
  font-weight: 300;
}

.header-links {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}
.header-links a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-bright);
  padding-bottom: 1px;
  transition: color var(--transition), border-color var(--transition);
}
.header-links a:hover {
  color: var(--accent);
  border-color: var(--accent);
  opacity: 1;
}

.header-rule {
  height: 1px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--border) 40%, transparent 100%);
  margin-top: clamp(2rem, 5vw, 3.5rem);
}

/* ─── Section indices ────────────────────────────────────────── */
.section-index {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.15em;
  align-self: start;
  padding-top: 0.2rem;
  min-width: 2.5rem;
}

/* ─── About ──────────────────────────────────────────────────── */
.about {
  padding-top: clamp(3rem, 7vw, 5rem);
  padding-bottom: clamp(2.5rem, 6vw, 4rem);
  border-bottom: 1px solid var(--border);
}

.about-inner {
  display: flex;
  gap: 2.5rem;
  align-items: start;
}

.about-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.about-text p {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 62ch;
  line-height: 1.75;
}

.skills-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.skills-bar span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--accent-dim);
  background: rgba(0, 229, 192, 0.07);
  border: 1px solid rgba(0, 229, 192, 0.15);
  padding: 0.2em 0.7em;
  border-radius: var(--radius);
}

/* ─── Projects section ───────────────────────────────────────── */
.projects-section {
  padding-top: clamp(3rem, 7vw, 5rem);
  padding-bottom: clamp(3rem, 7vw, 5rem);
  border-bottom: 1px solid var(--border);
}

.projects-header {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.projects-header h2 {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 2.5vw, 1.3rem);
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  margin-right: auto;
}

/* ─── Filter bar ─────────────────────────────────────────────── */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.filter-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  text-transform: uppercase;
  white-space: nowrap;
}

.dropdowns {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.dropdown-wrapper select {
  appearance: none;
  -webkit-appearance: none;
  background-color: var(--bg-card);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%234d6460'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.65rem center;
  border: 1px solid var(--border-bright);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  padding: 0.38em 1.8em 0.38em 0.75em;
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
  min-width: 130px;
}
.dropdown-wrapper select:hover,
.dropdown-wrapper select:focus {
  border-color: var(--accent-dim);
  color: var(--text-primary);
  outline: none;
}
.dropdown-wrapper select option {
  background: #131616;
  color: var(--text-primary);
}

/* Clear button */
.clear-btn {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border);
  padding: 0.35em 0.75em;
  border-radius: var(--radius);
  display: none;
  transition: color var(--transition), border-color var(--transition);
}
.clear-btn.visible { display: inline-flex; align-items: center; gap: 0.35em; }
.clear-btn:hover   { color: var(--accent); border-color: var(--accent); }

/* Active filter pills */
.active-filters {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  min-height: 0;
  margin-bottom: 1.5rem;
}
.active-filters:empty { margin-bottom: 0; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  background: rgba(0, 229, 192, 0.08);
  border: 1px solid rgba(0, 229, 192, 0.25);
  padding: 0.2em 0.65em;
  border-radius: 100px;
  animation: fadeSlideIn 150ms ease both;
}
.pill button {
  background: none;
  border: none;
  color: var(--accent-dim);
  font-size: 0.6rem;
  line-height: 1;
  padding: 0;
  transition: color var(--transition);
}
.pill button:hover { color: var(--accent); }

/* ─── Projects grid ──────────────────────────────────────────── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) * 2);
  overflow: hidden;
  margin-top: 1.5rem;
}

/* ─── Project card ───────────────────────────────────────────── */
.project-card {
  background: var(--bg-card);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  opacity: 0;
  transform: translateY(8px);
  transition: background var(--transition), transform 250ms ease, opacity 250ms ease;
}
.project-card.card-visible {
  animation: cardReveal 300ms ease both;
}
.project-card:hover {
  background: var(--bg-card-hover);
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.card-index {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}
.card-year {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
}

.card-title {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.card-summary {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}
.tag {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border: 1px solid var(--border-bright);
  padding: 0.15em 0.55em;
  border-radius: var(--radius);
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.tag:hover {
  color: var(--accent);
  border-color: var(--accent-dim);
  background: rgba(0, 229, 192, 0.06);
}

/* Expanded details */
.card-details {
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  animation: expandDown 200ms ease both;
}

.card-metric {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  background: rgba(0, 229, 192, 0.07);
  border-left: 2px solid var(--accent);
  padding: 0.45em 0.75em;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.card-description {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.card-link {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--accent);
  align-self: start;
  border-bottom: 1px solid rgba(0, 229, 192, 0.3);
  padding-bottom: 1px;
  transition: opacity var(--transition);
}
.card-link:hover { opacity: 0.7; }

/* Expand button */
.expand-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: none;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  align-self: start;
  text-transform: uppercase;
  margin-top: 0.25rem;
  transition: color var(--transition);
}
.expand-btn:hover { color: var(--accent); }
.expand-icon {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform var(--transition);
}
.project-card[aria-expanded="true"] .expand-icon {
  transform: rotate(-135deg) translateY(-2px);
}

/* ─── No results ─────────────────────────────────────────────── */
.no-results {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 3rem 1rem;
  text-align: center;
  letter-spacing: 0.05em;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  margin-top: 1.5rem;
}

/* ─── Contact ────────────────────────────────────────────────── */
.contact {
  padding-top: clamp(3rem, 7vw, 5rem);
  padding-bottom: clamp(3rem, 7vw, 5rem);
  border-bottom: 1px solid var(--border);
}

.contact-inner {
  display: flex;
  gap: 2.5rem;
  align-items: start;
}

.contact-content {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.contact-content h2 {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.5vw, 2.2rem);
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.contact-content p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.cta-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--bg);
  background: var(--accent);
  padding: 0.6em 1.25em;
  border-radius: var(--radius);
  margin-top: 0.5rem;
  align-self: start;
  transition: background var(--transition), opacity var(--transition);
  font-weight: 500;
}
.cta-link:hover { opacity: 0.85; }

/* ─── Footer ─────────────────────────────────────────────────── */
.site-footer {
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

/* ─── Animations ─────────────────────────────────────────────── */
@keyframes cardReveal {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes expandDown {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateX(-6px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ─── Responsive ─────────────────────────────────────────────── */
@media (max-width: 700px) {
  .header-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  .header-name h1 { font-size: clamp(2.8rem, 12vw, 4rem); }

  .about-inner,
  .contact-inner { flex-direction: column; gap: 1rem; }

  .projects-header { gap: 0.75rem; }
  .projects-header h2 { order: 1; width: 100%; }
  .filter-bar { order: 2; width: 100%; }

  .projects-grid { grid-template-columns: 1fr; }

  .site-footer { flex-direction: column; gap: 0.25rem; }
}